Eric and David have agreed to meet regularly on Monday nights to hack on the ultrasonic listening and echolocation kit idea/project. Tonight's goal: review all that we know, brain storm, and decide on a plan of attack for moving forward: what do we want to do/try first?

We hooked the speaker in the Secret Sounds toy up to frequency generator. You can hear the noise up to 16kHz-22kHz (depending on your age, mostly), and the device seems to work from 10kHz-80kHz. It's much louder at lower frequencies though - not sure if this is because of the frequency response of the speaker or the microphone. I believe this confirms the device as some kind of frequency division device, but you can hear some amplitude information as well, as verified by pressing the attenuation buttons on the frequency generator.